This artifact is a calcified jade ‘bi’ disc on an iron stand
It is a ceremonial jade object symbolizing the expanse of the skies (heaven), the inner hole signifies the universe’s center
Placed in elite tombs to safeguard souls and used during prayers to worship supreme deities.
Underground burial changed the stone’s minerals, the surface turns opaque and bone-white. Weathering creates rich brown and green textures and mottled patterns
Probably Zhou period (1046 BC to 256 BC)